version: '2'
services:
  rails:
    image: ruby:2.3
    # build:
    #   context: .
    #   dockerfile: docker/rails.Dockerfile
    # We'll specify a dotenv file for docker-compose to load more environment
    # variables into our app containers. This dotenv file would normally contain
    # sensitive data (API keys & secrets, etc) which SHOULD NOT be committed into
    # Git.
    # Keep in mind that any changes in this file will require a container restart
    # in order to be available on the app containers:
    env_file:
      - dev.env
    # Specify environment variables available for our app containers. We'll leave
    # a YML anchor in case we need to override or add more variables if needed on
    # each app container:
    environment: &app_environment
      # We'll overwrite the PATH environment variable to include the 'bin/'
      # directory, for the entrypoint script to find the app's executables:
      PATH: /usr/src/app/bin:/usr/local/bundle/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin

      # We'll set the REDIS_URL environment variable for the app to connect
      # to our redis container:
      REDIS_URL: redis://redis:6379

      DATABASE_URL: postgresql://postgres:3x4mpl3@postgres:5432/rails_example_dev

      # We'll set the RAILS_ENV and RACK_ENV environment variables to
      # 'development', so our app containers will start in 'development' mode
      # on this compose project:
      RAILS_ENV: development
      RACK_ENV: development
    cpu_shares: 4
    # Specify the directory from where all commands sent to the container will be
    # issued to where the code is mounted:
    working_dir: /usr/src/app

    # Keep the stdin open, so we can attach to our app container's process
    # and do things such as byebug, etc:
    stdin_open: true

    # Enable sending signals (CTRL+C, CTRL+P + CTRL+Q) into the container:
    tty: true
    volumes:
      # Mount our app code directory (".") into our app containers at the
      # "/usr/src/app" folder:
      - .:/usr/src/app

      # Mount the 'gems' volume on the folder that stores bundled gems:
      - gems:/usr/local/bundle